|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Sensitization Effects on Tensile Behavior in 5XXX Series Aluminum Alloys: Macro- and Mesoscale Observations
||Benjamin Palmer, John J. Lewandowski
|On-Site Speaker (Planned)
The desirability of 5XXX series Aluminum-Magnesium alloys for Naval use is tempered by their propensity to sensitize in the application environment. A contributor to this is the β phase, Al3Mg2, and non-equilibrium variants that preferentially precipitate at grain boundaries with various thermal exposures. These phases are anodic with respect to the matrix and can corrode and/or provide a path for environmentally enhanced cracking. However, the mechanisms behind this and other phases which may contribute in industrial alloys are less well known. In this study, interrupted tensile tests and microscopy are used to observe how strain accommodation is affected by sensitization in samples from the Short-Transverse (ST) direction of 5083-H116 rolled plates. The ST direction is chosen as it suffers the most severe mechanical degradation from sensitization. Additionally, Differential Scanning Calorimetry is used to characterize materials with different thermal exposures to search for phases that contribute to sensitization in such alloys.
||Planned: Supplemental Proceedings volume